GPS is an acronym for global positioning system and was developed in 1973.it is used to get the information about location of any point in the earth at any time using satellites.it is a space based navigation system.even GPS can be used for getting location near the earth to some extent.
GPS navigation system does not depend upon atmospheric conditions i.e. it can provide you information in all weather.
GPS navigation system consist of minimum 3 satellites and nowadays the number is 4 because the fourth one gives us the height of the observed point and the three other gives position in earth or nearby.
Anyone in earth can use GPS system through a GPS receiver.GPS provides a wide range of facilities and it has a variety of applications.it is initially a military project but later on commercialized.nowadays it has became very popular in civil and commercial usage.
BASIC CONCEPTS OF GPS
The GPS receiver receives the signal from the GPS satellites which are revolving around high above the earth.there are four or more satellites in a GPS system and each of the satellite continuously transmits messages towards earth.these messages includes-
1)the time the messages was transmitted by satellite.
2)all the orbital informations.
3)system health.
The receiver receives the transmitted messages and uses the transit time of messages on reaching to receiver from satellite and hence it computes the distance.
The position is then displayed either with a moving map or latitude and longitude,elevation information may be included.many GPS system could show informations such as direction,speed which they calculate from position changes.such informations are called derived informations.
We use more than 4 satellites to reduce the errors which results in wrong positional outputs. The only important thing is the satellites must be in line of sight,at least 6.
DESIGN
The GPS design originally called for 24 satellites or space vehicles .it has 8 space vehicles in three approximately circular orbits but this was later modified with 4 space vehicles in six orbits. 6 orbit planes have approximately 55 degree inclination and are separated by 60 degree ascension of the ascending node.
The orbital period is one half a sidereal day which is 11 hours and 58 minutes.atleast 6 satellites must be always in line of sight.all satellites broadcast at same two frequencies 1.575GHZ and 1.2276GHZ.
APPLICATIONS
Originally it is used only by Military but now widely used by civilians also. GPS has wide usage in commerce,scientific uses,tracking and surveillance. It is used in- Clock synchronization.telephony,disaster relief,emergency services,vehicle tracking,and all other tracking system,geotagging,GPS tours,map making,robotics,navigation,surveying and many more.
You May Also Be Interested In...
4G TECHNOLOGY
GPS(Global Positioning System),brief History
Wikipedia for more info about gps
BASIC CONCEPTS OF GPS
The GPS receiver receives the signal from the GPS satellites which are revolving around high above the earth.there are four or more satellites in a GPS system and each of the satellite continuously transmits messages towards earth.these messages includes-
1)the time the messages was transmitted by satellite.
2)all the orbital informations.
3)system health.
The receiver receives the transmitted messages and uses the transit time of messages on reaching to receiver from satellite and hence it computes the distance.
The position is then displayed either with a moving map or latitude and longitude,elevation information may be included.many GPS system could show informations such as direction,speed which they calculate from position changes.such informations are called derived informations.
We use more than 4 satellites to reduce the errors which results in wrong positional outputs. The only important thing is the satellites must be in line of sight,at least 6.
DESIGN
The GPS design originally called for 24 satellites or space vehicles .it has 8 space vehicles in three approximately circular orbits but this was later modified with 4 space vehicles in six orbits. 6 orbit planes have approximately 55 degree inclination and are separated by 60 degree ascension of the ascending node.
The orbital period is one half a sidereal day which is 11 hours and 58 minutes.atleast 6 satellites must be always in line of sight.all satellites broadcast at same two frequencies 1.575GHZ and 1.2276GHZ.
APPLICATIONS
Originally it is used only by Military but now widely used by civilians also. GPS has wide usage in commerce,scientific uses,tracking and surveillance. It is used in- Clock synchronization.telephony,disaster relief,emergency services,vehicle tracking,and all other tracking system,geotagging,GPS tours,map making,robotics,navigation,surveying and many more.
You May Also Be Interested In...
4G TECHNOLOGY
GPS(Global Positioning System),brief History
Wikipedia for more info about gps
